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A NEW ISOLATED MULTILEVEL INVERTER BASED ON
CASCADED THREE-PHASE CONVERTER BLOCKS
ABSTRACT
This paper presents a new topology of an isolated multilevel inverter that can be used for
high voltage and high power applications such as integrating battery storage systems and
alternative energy sources to power grid. With reduced number of components the proposed
cascaded multilevel inverter requires only one dc source by cascading high frequency
transformers.
The core building blocks in the multilevel inverter are the six-switch three-phase
converters that are controlled using PWM phase-shifted scheme for harmonic reduction.
Discussions have been given to compare the proposed cascaded multilevel inverter with typical
existing cascaded inverters. Simulation and comparison studies have been carried out to verify
the performance of the proposed multilevel inverter.
This paper presents a new topology of a cascaded multilevel inverter for high voltage
and high power applications such as grid connected battery storage systems and other alternative
energy sources to power grid. With reduced number of components the proposed cascaded
multilevel inverter requires only one dc source by cascading high frequency transformers. Well
established control strategies can be used for this multilevel converter.
The PWM phase-shifted scheme, a very popular method in industrial applications, is
used for the proposed inverter to reduce the harmonics in the output voltage. Simulation and
comparison studies have been carried out to verify the performance of the proposed inverter.
Block diagram for proposed system
DESIGNG SOFTWARE AND TOOLS:
MAT LAB /SIMULATION Software and sim power systems tools are used. Mainly control
system tools, power electronics and electrical elements tools are used.